<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form"  label-width="0px">
        <!-- 用户名 -->
        <el-form-item prop="username" >
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-users" ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item  prop="password">
          <el-input type="password" v-model="loginForm.password"  prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns" >
          <el-button @click="login" type="primary">登录</el-button>
          <el-button @click="resetLoginForm" type="info">重置</el-button>
        </el-form-item>
      </el-form>  
    </div>
  </div>
</template>

<script>
    export default {
        data() {
            return {
                // 这是登录表单的数据绑定对象
                loginForm: {
                    username: 'admin',
                    password: '123456'
                },
                loginFormRules: {
                    // 用户名验证
                    username: [{
                        required: true,
                        message: '请输入登录名称',
                        trigger: 'blur'
                    }, {
                        min: 3,
                        max: 10,
                        message: '长度在 3 到 10 个字符',
                        trigger: 'blur'
                    }],
                    // 这是密码的验证
                    password: [{
                        required: true,
                        message: '请输入登录密码',
                        trigger: 'blur'
                    }, {
                        min: 6,
                        max: 15,
                        message: '长度在 6 到 15 个字符',
                        trigger: 'blur'
                    }]
                }
            }
        },
        methods: {
            // 点击充值按钮重置登录表单
            resetLoginForm() {
                // console.log(this)
                this.$refs.loginFormRef.resetFields();
            },
            login() {
                this.$refs.loginFormRef.validate(async(valid) => {
                    if (!valid) return;
                    const {
                        data: res
                    } = await this.$http.post("login", this.loginForm);
                    if (res.meta.status !== 200) return this.$message.error("登录失败");
                    this.$message.success("登录成功");
                    // 1. 将登录成功之后的token,保存到客户端的sessionStorage中
                    //  1.1 项目中除了登录之外的其他API接口,必须在登录之后才能访问
                    //  1.2 token 只应在当前网站打开期间生效, 所以讲token保存在sessionStorage中
                    console.log(res);
                    window.sessionStorage.setItem('token', res.data.token);
                    // 2.通过编程式导航跳转到后台主页,路由地址是 /home
                    this.$router.push("/home")
                });
            }
        },
    };
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }
    
    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        border-radius: 5px;
    }
    
    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }
    
    .avatar_box img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
    
    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    
    .btns {
        display: flex;
        justify-content: flex-end;
    }
</style>